diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 372558036..a176e2938 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -240,7 +240,7 @@ Books on general-purpose programming that don't focus on a specific language are
 
 ### Ada
 
-* [A Guide to Ada for C and C++ Programmers](http://www.cs.uni.edu/~mccormic/4740/guide-c2ada.pdf) (PDF) (CC BY-NC-SA)
+* [A Guide to Ada for C and C++ Programmers](http://www.cs.uni.edu/~mccormic/4740/guide-c2ada.pdf) (PDF)
 * [Ada Distilled](http://www.adapower.com/pdfs/AdaDistilled07-27-2003.pdf) (PDF)
 * [Ada for the C++ or Java Developer](https://www.adacore.com/uploads/books/pdf/Ada_for_the_C_or_Java_Developer-cc.pdf) - Quentin Ochem (PDF) (CC BY-NC-SA)
 * [Ada Programming](https://en.wikibooks.org/wiki/Ada_Programming) - Wikibooks